. >> reporter: so law enforcement will be cracking down on drunk drivers. starting tonight through new year's day. police agencies including redwood city will have dui checkpoints. they estimate they will view about 15,000 cars. chp officers will have have maximum holiday enforcement. just over christmas alone they made 1,170 dui arrests. meanwhile today senator jerry hill introduced senate bill 55 targeting repeat offenders. it would require ignition interlock devices for drivers with more than one dui conviction. >> we have tried increasing fines. we have tried to revoke licenses to deter those chronic offenders. but we need to do more to save lives. >> reporter: a person would blow into a device before starting his car. if there's alcohol on his breath, it won't start. >> can they go around it? yes. but we're hoping that people would actually be more cautious if not for themselves then for other people they may kill on the road. >> reporter: these are required in many other states including new mexico, where recidivism rates went down by 75%. this weeken